Thermostatic switch



NOV. 5, 1929. J. J. COMPO THERMOASTATIC 'SWITCH Filed Feb. 9, 192'? NJULRTION WlT- msuLn'noN INSVLRTION Inventor JKM/7 f 70m/)0 'y ttorngy N 0 T l .L v U 5 m of the u -shape Patented Nov. 5,- 1929 JOHN J." como; or DEFIANCE, omo

THERMOSTATIC SWITCH Application filed February 9, 1927. Serial No. 166,901.

The present invention relates to a thermostatic switch and has for its principal object to provide a structure which will make and break with a snap.

Another important object of the invention lies in the provision of a substantially U-shaped spring metal member carrying between its ends a thermostatic metal member which at normal temperature is bowed outwardly therefrom and in engagement with a contact but as the temperature rises, the thermostatic stri will expand to flex the ends members so that when a predetermined point of` expansion has been reached the thermostatic metalvstrip will bow inwardl with aisnap to break the circuit.

A still further important object of the invention lies in the provision of a thermostatic switch of this nature which possesses 20 an exceedingly simple construction that may be manufactured at a low cost and yet be thoroughly strong and durable in construction and exceedingly ehcient and reliable in operation.

g With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement .of parts as will be 1 0 hereinafter more fully described and claimed.

In the drawing Figure 1 is a side elevation of the switch embodying the features of this invention showing the contacts engaged,

Figure 2 is a top plan view thereof,

Figure 3 is another side elevation thereof showing the points of contact separated,

Figure 4 is an end elevation thereof.

Referring to the drawing in detail, it will be seen that the numeral 5 denotes a sprin metal base of U-sha ed formation, one en of which is mounte on an insulator 6 by v means of screws 7 or in any other suitable manner. The lnumeral 8. denotes a strip of thermostatic metal bound between the two upright ends of the U-shaped base 5 b having the ends of the strip 8 forme with notches 9l the side walls of which have recesses '10 to receive the edges of the upright sides of the U-shaped base. 'When t-he switch is exposed to a desired temperature, the thermostatic metal strip will expand and force the upright ends of base 5 to sprin'g'apart enough downwardly past the center, breaking `or separating contact points lland 12, the latter of which is fixed to the strip 8 thereby opening or disconnecting an electric circuit associated therewith. The upper contact 11 is in thel form of a screw threaded through a desired spring action. The hinge-like mounting provided b notches 9 with their recesses will allow t e thermostatic strip freedom to travel up or down for binding or clamping. Thus the action of the switch causes the points to break or open and also to close with a snap.

It is thought that the construction, operation, and advantages of this invention will` now be apparent to those skilled in this art without a more detailed description thereof. Thefpresent embodiment of the invention has been disclosed in detail merely by wayv of example since in actual practice it attains the features of advantage enumerated as desirable in the statement of the invention and the above description.' It will be apparent *hat changes in the details of constrct'on, anu in the combination and arrangement of parts may-be resorted to without departin from the spirit or scope of the invention as ereinafter claimed or sacrificing any of its advantages. i

Having thus described my invention, what I claim as new is 1. In a thermostatic switch of the class described, an insulator, a U-shaped base of spring materia-l, means for attaching one end of the bight of the U-shaped base to the insulator, a stationary contact arranged above the base the ends of the base projecting upwardly from said bight, a thermostatic strip having notches formed in its ends wit-h recesses in to allow the thermostatic switch to snap e vle the side Wallis thereo' to 'eceve @he ends o 1me base io be bound these-between, seid smp` being interposed 'between seid bese and the commet so that nomslly the strip se e peede I termned tempeetme bows ouewedy from the bigh'e of the bose and im engagement wirt-h sao Contact.. y

2. In e. thermostetc switeh of the dess descrned, em insediato?, a lig-shaped bese of spring mste'ied, means for e'tsschmg one end of thebght of the U-shepeo bese eo the insu leto; a, stetiona'y contact *ehe ends of the base projecting upwex'dy from seid eight? e, thermostmc strip hevn notches formed in r its ends with recesses in t e side Walls 'fheeof zo receive the ends o1? the Tease to be bound. there-between so that mormsy the strip at a, predetermined tempeeture bows outwardly rcom the bight of the base, e second insulator foe supporting 'che contact, end e Z-sheped bracket ce the second imsue'fco'.

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